Well looking at the trajectory of both objects we'll see what they are within the next 20 years.
http://ssd.jpl.nasa.gov/sbdb.cgi?sst...cad=0#phys_par
Established Member
Well looking at the trajectory of both objects we'll see what they are within the next 20 years.
http://ssd.jpl.nasa.gov/sbdb.cgi?sst...cad=0#phys_par
Established Member
SG344 turned out to be an obvious asteroid, as well as evidently having been photographed before. I removed it from my post in lieu of that new information. Image here.Originally Posted by rommel543
This could strengthen the case that 1991 VG is also an asteroid.
It's been a number of years since I last checked up on these two.
Established Member
I'd be surprised if there were anything detected by SETI in its current incarnation. Not shocked, but surprised. The reason is that we're not really looking at very much. Extremely high gain antennas are necessarily narrow in their beam. We're not really scanning the sky for signs of intelligent life, we're scanning star systems one at a time, looking through a soda straw.
Any signal from more than a couple of light years would be very weak, even if it started off with gigawatts of power. This would be especially true if it were an omnidirectional transmission. To realistically think we might detect something we'd need to be looking at the right star system at the right moment and have the beam pointed in our general direction.
It would help a lot if we used large arrays of antennas to sweep the sky. The Allen Array will help to this end, but those telescopes are not super high gain, so they might just not cut it.
It is complicated even more by all the interference we generate on earth. Considerable effort has to be employed to reject these signals. This generally precludes larger beam antenna arrays. It also means that we really are forced to look in just a few areas of the spectrum. We can't really look at something like low UHF or VHF. You'd get so much atmospheric scatter and local interference from cell phones and television and radio, it would be very hard to pick anything out.
I think if we were really to have a good chance of finding something we'd need a lot of high gain antennas in an electronically steered array that could have variable beams to look at multiple parts of the sky and rapidly sweep both frequencies and space.
The best place to put radio telescopes would be on the far side of the moon. It always faces away from the earth so there's a huge amount of sheilding to block out artificial radio signals. Aside from a few deep space probes, the spectrum would be entirely clean.
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No we would need to aim where the star system was years ago. (maybe thousands)we'd need to be looking at the right star system at the right moment
Established Member
That makes me wonder…
Is SETI aiming their antennas where the star/galaxies are or were?
Order of Kilopi
One thing we can be sure about, since we are still here and alive, is that any advanced hostile civilisation out there has either not yet detected us or does not yet see us as a threat or we are just no use to them.
One thing not mentioned which maybe a possible factor in the lack of detection of any neighbours is that we could be the first most advanced civilisation within our current detection range. The galaxy could be teeming with life but who's to say how advanced that life is? Our own planet is good evidence of this, man has only been around for a minuscule portion of time for the existence of life on Earth. We have only really had any useful interstellar technology for the past say 100 yrs (excluding the telescope). The window of opportunity is so small how can we expect to find anything so soon? Time will tell i guess.
Order of Kilopi
Where the stars were, which is where we see them. Not much sense in measuring their velocity, computing their motions, and then looking at a patch of sky that'll be empty and silent for decades to come. Not that there'll be much difference in position over the time frames involved. The bigger problem is to be looking when there's a signal to be received...if they only transmit for brief periods, we could easily miss them.
The moon is not a good place for a SETI search station. You can only see at most half the sky at a given time, and obviously can not turn the moon to look at more interesting locations if there is reason to do so. One of the Earth-Sun trojan points would be good. Earth would be 1 AU away, greatly reducing interference, and very small in size. You could monitor Earth with a small high-gain antenna and detect what little interference remains by coincidence, while monitoring the entire sky continuously with wider angle antennas.
Banned
They took a spectrogram of the light coming from the object and found titanium oxide in it. This is the paint that was used on the Saturn V rocket. This was definitive proof that the object was a derelict S-IVB stage from the Apollo program. JPL did a thorough analysis of it. There is no longer any "mystery" about it.
Banned
Mom warns you about us because we're the fun ones. Fun requires risk. Mom doesn't want you taking risks when she's footing the bills.Hi there...we're the species your mother warned you about.
Member
One reason is because SETI has searched roughly 100 light years. Thats not a lot when you compare that to the size of our galaxy.
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